Physics

Problem

A copper wire of diameter

d = 2\,\text{mm}

carries a steady current

I = 5\,\text{A}

. The density of free electrons in copper is

n = 8.5 \times 10^{28}\,\text{m}^{-3}

. Calculate the drift velocity of the electrons. (Charge of electron

e = 1.6 \times 10^{-19}\,\text{C}